Hi SLB and welcome to Power surge.
Have you asked your doctor to check you for any bacterial infection such as bacterial vaginosis?
I know this can cause a discharge.
It must be coming from inside the vagina really. I dont think there is anything that could cause a discharge outside.
The only other thing I can think of is if your bladder is leaking a little. This is quite common is peri when the muscles become weaker I believe.
janet c